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Commitments and contingencies (Tables) | 12 Months Ended
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Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract] |
Schedule of minimum future lease commitments under leases | Minimum future lease commitments under leases in effect as of September 30, 2016 are as follows (in thousands):
| Office space |  | Equipment |  | Total
Year ending September 30, |  |  |  |  |  |  |  |
2017 | $ | 66,200 |  |  | $ | 4,475 |  |  | $ | 70,675 |
2018 | 46,185 |  |  | 3,779 |  |  | 49,964 |
2019 | 34,604 |  |  | 3,137 |  |  | 37,741 |
2020 | 20,670 |  |  | 1,910 |  |  | 22,580 |
2021 | 4,089 |  |  | 13 |  |  | 4,102 |
Thereafter | 2,330 |  |  | 2 |  |  | 2,332 |
Total minimum lease payments | $ | 174,078 |  |  | $ | 13,316 |  |  | $ | 187,394 |

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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